<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .main {
            width: 300px;
            height: 300px;
            background-color: skyblue;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
        }

        div {
            background-color: red;
            box-sizing: border-box;
            border: 1px solid black;
        }

        /*.item1 {*/
        /*    grid-column: 1 / 3;*/
        /*    grid-row: 1 / 3;*/
        /*}*/

        /*.item1 {*/
        /*    grid-column: 1 / span 2;*/
        /*    grid-row: 1 / span 2;*/
        /*}*/

        /*.item1 {*/
        /*    grid-area: 1/ 1/ span 2/ span 2;*/
        /*}*/

        /*.item1 {*/
        /*    grid-area: 2 / 2 / 4 / 4;*/
        /*}*/

        /*.item1 {*/
        /*    grid-area: 2 / 2 / span 2 / span 2;*/
        /*}*/

        .item1 {
            grid-area: 2 / 1 / 4 / 3;
        }
    </style>
</head>
<body>
<div class="main">
    <div class="item1">1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
    <div>6</div>
</div>
</body>
</html>
